On 06/15/2016 08:51 AM, llyzs wrote:
Hi Devs,
I have a virtual PCI device added on VirtualBox OSE and a driver which
sends I/O to do some stuff in the host and receive interrupts when the
work is done. The interrupts work most of the time, however there are
random delays between PDMDevHlpPCISetIrq is called and the driver ISR
is called. Most of the time there is no delay (<1ms) but periodically
there is a delay from 10+ms to even 60+ms. One more strange thing is
that the delay mostly happen at exactly every 500ms. So anyone can
give me some hint on what is causing the interrupt delay? What kind of
job inside VirtualBox that runs every 500ms that might be causing
interrupt delay?
I am on Windows 8.1 x64 (both guest and host). Thanks in advanced.
Just curious, have you tried this with the VirtualBox 5.1 beta? The APIC
and I/O APIC implementations in VirtualBox were completely re-done and
it resulted in fixing long-standing problems of the nature you describe
(for e.g., EOI on level-triggered interrupts not causing the I/O APIC to
immediately pickup pending interrupts until another interrupt arrives
and a few others problems).
Regards,
Ram.
Vic
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